reset upstream subtrees to yocto 2.6

Reset the following subtrees on thud HEAD:

  poky: 87e3a9739d
  meta-openembedded: 6094ae18c8
  meta-security: 31dc4e7532
  meta-raspberrypi: a48743dc36
  meta-xilinx: c42016e2e6

Also re-apply backports that didn't make it into thud:
  poky:
    17726d0 systemd-systemctl-native: handle Install wildcards

  meta-openembedded:
    4321a5d libtinyxml2: update to 7.0.1
    042f0a3 libcereal: Add native and nativesdk classes
    e23284f libcereal: Allow empty package
    030e8d4 rsyslog: curl-less build with fmhttp PACKAGECONFIG
    179a1b9 gtest: update to 1.8.1

Squashed OpenBMC subtree compatibility updates:
  meta-aspeed:
    Brad Bishop (1):
          aspeed: add yocto 2.6 compatibility

  meta-ibm:
    Brad Bishop (1):
          ibm: prepare for yocto 2.6

  meta-ingrasys:
    Brad Bishop (1):
          ingrasys: set layer compatibility to yocto 2.6

  meta-openpower:
    Brad Bishop (1):
          openpower: set layer compatibility to yocto 2.6

  meta-phosphor:
    Brad Bishop (3):
          phosphor: set layer compatibility to thud
          phosphor: libgpg-error: drop patches
          phosphor: react to fitimage artifact rename

    Ed Tanous (4):
          Dropbear: upgrade options for latest upgrade
          yocto2.6: update openssl options
          busybox: remove upstream watchdog patch
          systemd: Rebase CONFIG_CGROUP_BPF patch

Change-Id: I7b1fe71cca880d0372a82d94b5fd785323e3a9e7
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-openembedded/meta-networking/recipes-support/htpdate/htpdate/0001-Make-environment-variables-assignments-to-be-weak.patch b/meta-openembedded/meta-networking/recipes-support/htpdate/htpdate/0001-Make-environment-variables-assignments-to-be-weak.patch
new file mode 100644
index 0000000..0ee44c1
--- /dev/null
+++ b/meta-openembedded/meta-networking/recipes-support/htpdate/htpdate/0001-Make-environment-variables-assignments-to-be-weak.patch
@@ -0,0 +1,31 @@
+From 04603f52d793f964653e6a985944400fe4fa87ee Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Wed, 13 Jun 2018 17:50:20 -0700
+Subject: [PATCH] Make environment variables assignments to be weak
+
+So that OE can override them for cross builds
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ Makefile | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index 1c80c09..884126c 100644
+--- a/Makefile
++++ b/Makefile
+@@ -2,11 +2,11 @@ prefix = $(DESTDIR)/usr
+ bindir = ${prefix}/bin
+ mandir = ${prefix}/share/man
+ 
+-CC = gcc
++CC ?= gcc
+ CFLAGS += -Wall -std=c99 -pedantic -O2
+ 
+-INSTALL = /usr/bin/install -c
+-STRIP = /usr/bin/strip -s
++INSTALL ?= /usr/bin/install -c
++STRIP ?= /usr/bin/strip -s
+ 
+ all: htpdate
+